Released in 1992 in Japan, with product number 4 967652 400168.
Download: PoP1_FM_Towns.iso (8.8MB; includes sound effects but not CD music)
You will also need an emulator (Unz_0.5_L30.zip; 1.2MB) and a floppy image (floppy.bin; 1.3MB).

A manual for GNU/Linux: CDEmu.pdf (339KB)
Windows users can start at step 16 of the above manual.

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The FM Towns release uses the same music as the PC Engine (TurboGrafx) release of November 1991.
Soundtrack as MP3s: PoP1_FM_Towns_and_PC_Engine_Music.zip (73MB)